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Global statistics

These statistics are computed automatically from users’ data, which can be inaccurate or incomplete (especially legacy data migrated from the previous LORD version). Therefore, they must be interpreted carefully. For more details, please read the guide.

Demography

Total number of rats 49,191 rats
 ⨽ females  ⨽ 25,239 females (51.31 %)
 ⨽ males  ⨽ 23,952 males (48.69 %)
Rats considered as deceased 45,970 rats (93.5 % of all rats)
 ⨽ declared with known date  ⨽ 21,782 rats (47.4 % of deceased rats)
 ⨽ presumably dead  ⨽ 24,188 rats (52.6 % of deceased rats)
Lifespan
 ⨽ average  ⨽ 22.2 months (♀: 22.6 months – ♂: 21.8 months)
 ⨽ average, infant mortality excluded  ⨽ 22.7 months (♀: 23.1 months – ♂: 22.3 months)
 ⨽ average, accidents also excluded  ⨽ 23.5 months (♀: 23.8 months – ♂: 23.1 months)
 ⨽ maximum  ⨽ 4 years, 3 months, 28 days (DS. Cerberus)

Breeding

Total number of ratteries 686 ratteries
 ⨽ active in the last 2 years  ⨽ 34 ratteries (4.96 %)
Average rattery lifetime 905 days (2.5 years)
Average rattery productivity 8.4 litters (44.7 rats)
 ⨽ as birth place  ⨽ 6.7 internal litters
 ⨽ as other contributor  ⨽ 1.7 external litters
Average mother age 233 days (7.6 months)
Average father age 439 days (14.4 months)
Average litter size 6.6 pups (debiased estimation: 10.3 pups)
Average sex ratio 0.987 (about 101 females for 100 males)

Mortality

Median death age 23 months (50 % of rats die before this age, 50 % after)
Death peak 24 months (death occurs more often at this age than any other)
Interquartile interval 16-27 months (50 % of rats die in this age interval)
Leading death category “Other” (25 % of declared deaths)
Leading death cause “*Old age, natural death (from 24 month old minimum)” (23 % of declared deaths)

Death categories

Number of recorded deaths 21,782 rats (47 % of rats considered as dead)
By decreasing frequency * please note that tumours without recorded localization appear as « Autres »
24.97 %
Other
22.8 %
Old age, natural death (from 24 month old minimum)
16.91 %
Unknown cause
12.42 %
Respiratory
7.89 %
Accidents, traumas, poisonings
7.08 %
Neurological (brain, spinal cords, nerves)
2.15 %
Infant mortality (up to 6 week old)
1.36 %
Eye, ear, mouth, face
1.35 %
Reproductive system
1.16 %
Cardiovascular
0.92 %
Digestive
0.72 %
Urinary system (kidney, bladder)
0.26 %
Skin
0.05 %
Muscles and skeleton

Most frequent death causes

Number of deaths with recorded cause 21,782 rats (47 % of rats considered as dead)
By decreasing frequency * for rats recorded as dead without precise cause, death category is used instead
22.8 %
*Old age, natural death (from 24 month old minimum)
16.87 %
Undetermined cause (known date)
14.56 %
Undetermined tumor (affected organ unknown)
7.66 %
*Respiratory
4.76 %
Domestic accident (crush, door...)
4.61 %
Undetermined infection or abscess
4.25 %
Bronchitis, pneumonia
4.19 %
Stroke
3.2 %
*Other
2.2 %
Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
1.91 %
*Neurological (brain, spinal cords, nerves)
1.53 %
Veterinary accident (anesthesia during a minor operation, medical error, etc.)
1.14 %
Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
1.08 %
*Infant mortality (up to 6 week old)
0.93 %
Heart failure, valvular disease
0.73 %
Stillborn
0.58 %
Pituitary tumor
0.56 %
Otitis, ear abscess
0.49 %
Mammary tumor
0.47 %
Complications of gestation or parturition
0.45 %
Renal failure
0.28 %
Intestinal obstruction (excluding megacolon)
0.25 %
Facial tumor (excluding Zymbal tumor)
0.24 %
Lung tumor
0.23 %
Zymbal gland tumor
0.21 %
Digestive tumor (stomach, liver, pancreas, intestines...)
0.2 %
Epilepsy
0.2 %
Lack of milk
0.17 %
Food poisoning
0.17 %
Hereditary megacolon
0.17 %
Uterus infection (metritis, pyometra)
0.16 %
Pulmonary edema
0.13 %
Liver failure
0.12 %
Brain tumor
0.12 %
Other respiratory trouble
0.12 %
Generalized cancer, leukemia, lymphoma
0.11 %
Malformation, hydrocephalus
0.11 %
*Urinary system (kidney, bladder)
0.11 %
Heart attack, infarct, pulmonary embolism
0.11 %
Tooth abscess
0.09 %
Other tumor (salivary, spleen, adrenal, thyroid...)
0.09 %
Heatstroke
0.09 %
Suffocation, choking
0.09 %
Uterine tumor
0.09 %
*Skin
0.08 %
Dental malocclusion
0.08 %
Pododermatitis
0.07 %
Other heart or vascular problem
0.07 %
Falls, fractures, head or spinal cord trauma (excluding fights)
0.06 %
Vaginal prolapse (excluding tumors and postpartum)
0.06 %
Facial abscess (excluding teeth and Zymbal gland)
0.06 %
Kidney tumor
0.05 %
Hemorrhage (exaggerated relative to the context, coagulation disorder, hemophilia)
0.05 %
Other digestive trouble
0.04 %
Allergy, anaphylactic shock
0.04 %
Urinary or kidney infection
0.04 %
Other neurological trouble
0.04 %
Diabetes
0.04 %
*Unknown cause
0.04 %
Other known cause fitting no other category
0.04 %
Skin tumor, skin cancer
0.04 %
Subcutaneous abscess
0.03 %
Other infant mortality cause
0.03 %
Sepsis
0.03 %
*Eye, ear, mouth, face
0.03 %
Other reproductive system disorder
0.03 %
Bladder tumor
0.03 %
Digestive hemorrhage
0.02 %
Progressive spinal cord damage, degenerative paralysis
0.02 %
Malnutrition
0.02 %
Other urinary disorder
0.02 %
Euthanasia without medical cause
0.02 %
Other accident or trauma
0.02 %
Digestive abscess
0.02 %
Other head related trouble
0.02 %
Brain infection, encephalitis, meningitis
0.02 %
Urethral obstruction, urinary retention, stones
0.02 %
*Accidents, traumas, poisonings
0.01 %
Muscle tumor
0.01 %
Other musculoskeletal trouble
0.01 %
Extensive skin infection (pyoderma, bedsores, etc.)
0.01 %
Bone tumor
0.01 %
Retro-orbital abscess
0.01 %
Vaginal tumor
0.01 %
Glaucoma
0.01 %
Gastroenteritis, diarrhea
0.01 %
Ovarian tumor
0.01 %
*Cardiovascular
0.01 %
*Digestive
0.01 %
*Reproductive system
0 %
Testicular tumor
0 %
Retro-orbital tumor
0 %
Parasites
0 %
Joint or bone infection, septic arthritis

Most frequent tumours

Number of tumour-related deaths 3,738 rats (17.16 % of rats with known death cause)
By decreasing frequency * please note that tumour localization could not be recorded before 2023
84.86 %
Undetermined tumor (affected organ unknown)
3.37 %
Pituitary tumor
2.86 %
Mammary tumor
1.44 %
Facial tumor (excluding Zymbal tumor)
1.39 %
Lung tumor
1.34 %
Zymbal gland tumor
1.2 %
Digestive tumor (stomach, liver, pancreas, intestines...)
0.72 %
Brain tumor
0.72 %
Generalized cancer, leukemia, lymphoma
0.54 %
Other tumor (salivary, spleen, adrenal, thyroid...)
0.51 %
Uterine tumor
0.32 %
Kidney tumor
0.21 %
Skin tumor, skin cancer
0.16 %
Bladder tumor
0.08 %
Bone tumor
0.08 %
Muscle tumor
0.08 %
Vaginal tumor
0.05 %
Ovarian tumor
0.03 %
Retro-orbital tumor
0.03 %
Testicular tumor
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